NFPA 90A and Smoke Dampers
NFPA 90A and Smoke Dampers
(OP)
I am laying out a school that has a lot of smoke rated partitions. I am trying to use Figure A.5.3 as a go-by to figure out where to place the smoke dampers for the return air path and I am coming up with a large amount of dampers. Does anyone know of a resource I can use to back check myself
Mainly I am looking for information about the return air trunk duct that does cross through smoke rated partitions, sometimes it picks up return air from rooms and other times it passes just through the partition.
Mainly I am looking for information about the return air trunk duct that does cross through smoke rated partitions, sometimes it picks up return air from rooms and other times it passes just through the partition.





RE: NFPA 90A and Smoke Dampers
If they are smoke partitions and not barriers, you do not need dampers for ducted systems under NFPA 90A and IBC 2009. Note that IBC will still require a smoke damper for transfer ducts.
As always, this is just for the local codes I am familiar with, consult your local authority and codes.